israel. we are on both sides of the border in the line of fire. our sara sidner is in gaza city. let's go to southern israel where israeli tanks are on the move. the israeli defense forces say at least 30,000 troops are being mobilized along the border with gaza and thousands more are getting their marching orders. as we said, cnn's frederick is live along the border. you have been on the front lines there. what type of military activity are you seeing? >> hi, randi. a lot of military activity going on here between the border area between gaza and israel. we just had armored vehicles come through here and moving in closer to the border. of course, a lot of people believe that israelis must launch a ground offensive into gaza quite soon and we are seeing a lot of troops really near the border of our area and the israelis have also called in tens of thousands of reservists and reporting for duty right now. when you go along the border area you see units that are hiding behind tree lines and the